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A general danger sign can be issued, for example, in large fires where a lot of toxic smoke is produced, in gas hazard situations or in radiation hazard situations. When it is necessary to protect yourself inside, you must try to make the apartment as tight as possible. Doors, windows and ventilation openings are closed and all gaps are sealed with e.g. plastic films and tapes. Ventilation is stopped. Sheltering inside is usually necessary for a few hours or a day at most.